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The Sage website, including online ordering services, may be unavailable due to system maintenance on 18th January between 2:00 am and 8:30 pm GMT. If you need assistance please contact our Customer Service team. Thank you for your patience and we apologise for the inconvenience.

Cathy Ball Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, UK